How To Fix CNV799 - No or too many fields marked with Multicopy Position "First" in table &1

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV - Conversion: Messages for Conversion Services (CNCC)

• Message number: 799

• Message text: No or too many fields marked with Multicopy Position "First" in table &1

What causes this issue?

If the "Multicopy" indicator is set, there must exist exactly one field
with Multicopy Position is set to 'F' (First in loop). "Multicopy"
indicator was set for table &V1& but there is either no field or more
than one field for which Multicopy Position set to "F".

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Either delete the "Multicopy" indicator for table &V1& or configure
exactly one field to be first in Multicopy Loop.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV799 - No or too many fields marked with Multicopy Position "First" in table &1 ?

  The SAP error message CNV799 indicates that there is an issue with the configuration of the multicopy position in a specific table during a data migration or conversion process. This error typically arises in the context of SAP's data migration tools, such as the SAP S/4HANA Migration Cockpit or other data transfer processes.
  
  Cause:
  The error message "No or too many fields marked with Multicopy Position 'First' in table &1" suggests that:
  
  No Fields Marked: There are no fields in the specified table (&1) that are marked as the "First" multicopy position. This is necessary for the system to know which field should be used as the primary reference when copying data.
  Too Many Fields Marked: Alternatively, if multiple fields are marked as the "First" multicopy position, the system cannot determine which one to use, leading to ambiguity.
  
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Table Configuration:
  
  Go to the Data Dictionary (SE11)